When you try to remove an ActiveSync device from either the Exchange Management Shell or the Exchange Administration Center, you receive the following error message:
WARNING: An unexpected error has occurred and a Watson dump is being generated: DeviceId cannot contain hyphens.
This problem occurs because the CNF value conflicts with the ActiveSync device.
To fix this problem, install Cumulative Update 12 for Exchange Server 2013.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Learn about the terminology that Microsoft uses to describe software updates.